Dispensing machine



March 16 ,1926;

- I M. M. ENos DISPENSING MACHINE Filed Apil 14, 1925 nvznkoz m 65...

Patented Mar. 16, 1926.

PATENT OFFICE.

.MANUEL M. ENOS, OF OAKLAND, CALIFORNIA.

DISPENSING .MAGIE-HNE.

Application filed April 14, 1.925. Serial No. 23,005.

To (z'ZZ whom it may concern.:

Be it known that I, MANUEL M. ENos, a citizen of the United States,residing at Oakland, in the count-y of Alameda and State of California,have invented certain new and useful Improvements in DispensingMachines, of which the following is a speci,- iication.

This invention relates to an apparatus or machine for dispensing ofliquid and semiliquid substances such as oil and grease, and will befound particularly useful as a grease gun for delivering grease toautom0- bilcs, all kinds of machinery and places where lubrication isnecessary, the grease being expelled from a cylinder or container hymeans of air pressure derivedfrom an air chamber in which air iscompressed by means of a screw operated plunger or piston acting againsta floating piston in the' grease chamber. Means are provided for storingor saving some of the compressed air, which also may be used forreturning the piston in the grease chamber to its original positionafter all the grease is expelled therefrom.

The invention is illustrated in the accompanying drawing which is alongitudinal section of one form of the machine.

Referring specifically to the drawing, 12 indicates an air cylinder inwhich works an air tight piston 13 operated by a screw 14 provided withahand wheel 15 for turning the same. This air chamber communicates atone end thru a valve 2 with one end of a reserve air tank 7, and at theother end thru a valve 3 with the opposite end of said tank 7. Thegrease cylinder 11, in which is a floating piston 10, has an automaticair valve 23 to admit air into chamber 12 during backward travel ofpiston 13. Stops 16 limit the `back travel of piston 10 At the dischargeend the grease cylinder 11 has an outlet 9 to which a hose is connected.This outlet is part of filler plug 22, thru which the grease chamber 11can be filled on occasion.

The cylinder 7 is connected by a pipev 17 to the front end of greasechamber 11, and the pipe line has a stop cock 4 and also a stop cock 6with a one way check. A gage 8 may be connected to-the air chamber 12. Agraduated indicator rod 20 may be attached to the piston 10 and worksthru a hole in the end of the grease cylinder, andV is provided withmarks indicating quantity vided in the end of air chamber 12 to relievethe pressure therein or to take in air if desired. Also, the pistons 13and 10 may be connected by a chain 18, if desired.

In the operation of this form of the apparatus, if the piston 13 isadvanced, cock 1 being opened and cocks 3 and 4 being closed, air iscompressed in chamber 12 and this pressure acting against the piston 10will advance the same and force grease thru the outlet 9. When thepiston 13 is screwed back stop cock 1 is closed and stop cock 2 isopened and the air is'compressed thru the small tank 7, and thru pipe 17(check-valve 4 being opened) to the front end going thru check valve 6into grease cylinder 11 and pushes piston 10 back into the rear end ofthe grease cylinder against the stop 16.

`Grease cylinder 11 is now filled, then cocks 3 and 4 are closedi andfurther movement back of the piston 13 compresses. airinto 'tank 7. Thenif desired, cock 3 is opened and the compressed air escapes from tank 7into the front end of the main air cylinder 12. This increases the airpressure to a greater degree than could be done otherwise. Should agreater pressure still be desired, the moving of the piston 13 forwardand backward (closing valve 3 with backward movement of piston) willproduce the necessary pressure. The action of piston 13 going forwardcompresses air in chamber 12, or in tank 7 if cock 3 is open. The returnor backward movement of piston 13 compresses air in tank 7 because ,ofthe one way valve 2. The purpose of using the pressure on the returnstroke of the piston is first to return piston 10 to stops 16, when thegrease chamber is empty and to increase the pressure in the chamber 12,in front of piston 13 after grease chamber 11 is filled and cock 24 lsshut off, and letting the pressure from the small tank enter the bigtank 12 before starting piston 13 on its forward stroke. The amount ofgrease delivered can be seen by watching the advance of rod 20. Screwstop pin 25 will prevent piston 13 from going further than is necessaryor to stop before entering grease chamber 11.

It will be seen that piston 10 is one of the` V most important featuresof my invention. If compressed air were admitted to grease chamber 11,without any piston therein, it would expel apart of the grease therein,but not all. After such part of the grease had been expelled, thecompressed air would issue from the discharge valve. Piston 10 serves toeject all ofthe grease in chamber 11. Again, the operation of piston 13will create an air pressure upon piston 10, and piston 10 will exertsuch pressure upon the grease in chamber 11. The piston 13, having setnp the pressure on piston 10, has performed its function, and thepressure re mains upon piston 1() ready to eject grease from chamber l1when the discharge Valve is opened. Thus it is not necessary to touchthe operating parts of'piston 13 when the-apparatus is being' used togrease a ear or the like. flt is only necessary to open the dis chargevalre` and piston 10, actuated by the constant air of the grease.

The air pressure provides convenient and improved means for advancingthe piston in pressure, will e'liect a dischz'irg'e' the grease cylinderto the desired extent, and for returning the same to refill thecylinder.

I claim:

1. In a machine for dispensing grease, the combination ot' an aircylinder, a piston therein, means to advance and retract the piston, anauxiliary air chamber connected to opposite ends of the air cylinder,cocks in said connections, a grease cylinder, a l0at ing' pistontherein, and connections provided with valves from the air cylinder toopposite ends ot the grease cylinder, said grease cylinder having: anoutlet at one end.

2. A dispensingl machine as set forth in claim l. the ,grease cylinderbeing in axial alinelnent with the air cylinder and being open at oneend thereto.

In testimony whereof I afiix my signature.

MANUEL M. ENOS.

